Chrysler RAM TRUCK 2500 1994 Service Manual page 355

8C - 8 OVERHEAD CONSOLE •
ROOF PANEL
(5) Place an 8-1/2 X 11 piece of paper on the center
of the roof at the windshield, oriented lengthwise
from front to rear. The purpose of the paper is to pro­
tect the roof panel from scratches and define the area
to be degaussed (Fig. 2). Figure 2 shows the recom­
mended sweep pattern of 1/2-inch between passes i n
a sweeping zig-zag pattern.
P U L L T I P O F D E G A U S S I N G T O O L A W A Y
C
AT LEAST T W O FEET A N D
D I S C O N N E C T
c
3
C
C
1/2"
c
c
START
J908E-27
Fig. 2 Roof Demagnetizing Pattern
(6) Plug i n the demagnetizing tool. Keep the tool at
least 2 inches away from the compass unit.
(7) Slowly approach the center of the roof panel at
the windshield with the demagnetizing tool plugged
in.
(8) Contact the roof panel with the tip of the tool
(be sure template is i n place to avoid scratching the
roof panel). Use slow sweeping motions of 1/2 inch
between sweeps. Move the tool approximately 4
inches either side of the centerline and at least 11
inches back from the windshield.
(9) With the demagnetizing tool still energized,
slowly back i t away from the roof panel until the tip
is at least 2 inches from the roof. Unplug the tool.
(10) Calibrate the compass and set the variance as
described.
SELF*DIAGNOSTIC TEST
The self-diagnostic test is used to confirm that the
display and all of its segments are operating prop­
erly. Initiate the self-diagnostic test as follows:
(1) With the ignition switch i n the OFF position si­
multaneously press and hold the COMP/TEMP but­
ton and the US/METRIC button.
(2) Turn ignition switch to ON.
(3) Continue to hold both buttons until segments
on the display light. The module is now i n self diag­
nostic test.
The display will respond by cycling through the fol­
lowing characters:
N 00
NW 11
W 22
SW 33
S 44
SE 55
E 66
NE 77
l b repeat test, press the COMP/TEMP button.
Pressing the US/METRIC button will light every seg­
ment of the display for 2 seconds. To repeat test,
press the COMP/TEMP button. To exit diagnostics,
press the US/METRIC button. The module will re­
turn to compass/thermometer mode.
Should any segment i n any of the digit posi­
tions fail to light, the unit is defective and
should be replaced.
B + (AT
ALL TIMES)
LAMPS
G R O U N D
B + (KEY O N )
PANEL DIMMER
COURTESY
DOOR SWITCH
GROUND
HEADLAMPS ON/OFF
INPUT
J948C-19
Fig. 3 Compass/Temperature Harness Connector
THERMOMETER SENSOR REPLACEMENT
The sensor is mounted to the radiator support on
the driver's side just behind the grille (Fig. 1).
(1) Raise hood to access the sensor.